mediawiki.action.view.redirectPage: Correct a CSS selector

Follow-up to 7dc4b586. .redirectTo was used for an early version of
that patch, I forgot to update it.

Change-Id: I935a761cb9e0c231afd098b5f1f3114240a9bf1f
(cherry picked from commit 0d049cdf2becd7374ce3705c4c32a129d51e8c45)